JP2004321725A - Hand drill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hand drill capable of reducing the resistance from a side surface of a hole caused by hand deviation or the resistance when pulled out, securing a sufficient strength and penetration power in a short period of time, smoothly discharging chips, cutting sharp with a small cross section area, securing the space for discharging bone chips without producing deficiency such as bending, and being easily lifted up. <P>SOLUTION: In the hand drill, both edges of a diagonal linear chip groove are blades, and the blades on both edges of the chip groove become gradually acute in the direction of rotation. In another case, the tip of a cylindrical material is pressed and edged in the double-edged shape. A hook hole for pulling up a suture wire is formed on a side surface on the tip side. A grip part is connected to an end of a drill shaft by the insert-molding process and formed in a shape with unevenness closely fitting the palm of an operator's hand. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a hand drill for manually drilling holes.
[0002]
[Prior art]
In a normal drill, a spiral groove is cut in two directions from the tip to the near side, and only the tip is sharpened. The half moon drill has a blade that is cut from the center of the conical tip toward the hand. Kiri simply cuts out the tip of the material of the quadrangular prism in a pyramid shape.
[0003]
A hand drill blade shape for drilling a large diameter hole has been proposed. (Patent Documents 1 and 2) There are also proposals regarding positioning and fixing jigs. (Patent Documents 3, 4, and 5)
[0004]
In cardiovascular surgery, the sternum, which is usually located in the center of the chest, is longitudinally incised, the surgery is performed, and after completion, the sternum is fastened with a material such as stainless steel wire. As a means for penetrating the wire through the sternum, a needle connected to the end of the wire is grasped and penetrated by a needle holder, or penetrated using a sternum penetrating instrument, and the wire is passed through the hole at the tip, There is a method to raise it. (Patent Documents 6 and 7)
[0005]
[Patent Document 1]
JP-A-9-29524
[Patent Document 2]
JP-A-9-29526
[Patent Document 3]
JP-A-6-270005
[Patent Document 4]
JP-A-7-80712
[Patent Document 5]
JP-A-2003-39217 (P2003-39217A)
[Patent Document 6]
Japanese Patent Application No. 2000-045190
[Patent Document 7]
Japanese Patent Application No. 2000-309910
[0006]
[Problems to be solved by the invention]
Since a normal drill is sharpened only at the tip, if a hole is manually drilled, camera shake will occur and resistance from the side of the hole will be strongly received. Also, when trying to pull out the drill after drilling the hole, the helical portion is caught and may have to be pulled hard or may not be able to be pulled out without prying.
[0007]
Since the half moon drill cuts off a volume that is almost half the diameter, it lacks strength and is unsuitable for hard objects or deep holes. If the cutting volume is reduced, chips accumulate in the holes and the load increases. Depending on the direction of rotation, it is shaved from the center of the tip with only one blade, and therefore lacks penetration.
[0008]
Since the drill simply cuts the end of a square pole into a square pyramid, the sharpness is extremely poor.
[0009]
The bone structure consists of hard cortical bone over relatively bloody, relatively soft cancellous bone. It bleeds when pierced with a device with a large cross-sectional area, and it takes time to stop bleeding. Sharp sharpness is required with a small cross-sectional area, but it is difficult to penetrate cortical bone easily in a short time with a structure that only has a simple cut surface at the tip like a conventional product, and it often bends And so on.
[0010]
When a hole is made in a bone tissue, a space for discharging bone shavings is not secured in a conventional penetrating instrument, and a penetration resistance is further increased from a clogged state.
[0011]
After penetrating the sternum, the sternum penetrating instrument is pulled up through a suture wire through the hole at the tip. However, a great resistance is applied when the instrument is pulled up, and a doctor wearing gloves with blood cannot easily pull it up.
[0012]
[Means for Solving the Problems]
The shape of the hand drill tip blade is tapered and has a width from the center of the tip to one edge, and a slant straight chip groove is formed from the tip toward the hand. Both edges of the chip groove are blades. In order to minimize frictional resistance, both edges of the chip groove having a tapered tip have a structure in which the blade gradually becomes acute in the rotating direction, separates from the bone surface, and avoids contact with the bone surface.
[0013]
A cylindrical drill tip is tapered in two planes from the apex toward the hand, and its peripheral edge is sharpened. The ridgeline of the apex is inclined from both edges toward the center, and is provided with a blade. The center of the ridgeline is a groove in the vertical direction, forming two blades. A straight slit was formed in the longitudinal direction from the lower end of the two-plane taper.
[0014]
The shape of the tip blade is a fork-shaped two-blade, and the two-blade tip is bladed so as to incline from the outside to the inside. The blade shape is sloped toward the tip.
[0015]
A sternum suture drill having a hook groove for pulling up the suture wire on the side surface from the tip was formed.
[0016]
A rod-shaped grip is connected vertically to the end of the drill shaft, and the end of the drill is sandwiched between the index and middle fingers. And
[0017]
A T-shaped flat plate-shaped grip is connected to the end of the drill shaft, and the surface of the T-shaped flat plate is provided with dimples or dents for the purpose of preventing slippage.
[0018]
The tip is formed by pressing using a metal round bar, then the blade is sharpened with a polisher, pressed into a metal core for rotation prevention and reinforcement, and the grip part and metal core part are formed by resin insert molding. Was formed as a manufacturing method.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 and FIG. 2 (enlarged end view) show an embodiment of the present invention and show a sternum suture drill among hand drills. The material of the drill is usually high-speed steel or super steel. In the case of a medical drill, stainless steel SUS304, 330, 420 or the like is selected from the viewpoint of preventing rust and avoiding breakage. The shape of the tip blade shown in the figure is tapered, and a cutting groove 1 having a width from the center of the tip to one edge and being obliquely straight from the tip toward the hand is formed by pressing. Both edges of the chip groove 1 are blades. The chip groove 1 reduces the load on the entire drill in order to efficiently discharge the chip shaved from the tip. The chip groove 1 may be formed parallel to the material up to the root, but if the entire drill becomes flat, the bending strength is insufficient. To minimize frictional resistance, both edges of the tapered chip groove are sharpened. In the rotation direction, the blade 2 gradually becomes acute with respect to the tip angle, separates from the bone surface, and has a structure to avoid contact with the bone surface. Hook holes 3 for pulling up the suturing wire are formed on the side of the distal end by pressing. If the hook hole 3 is opened avoiding the center line of the drill shaft, there is no fear of breakage. The tip of the drill is pressed into a metal core for the purpose of preventing rotation and reinforcing, and the grip 4 is connected to the metal core by insert molding. The material of the grip 4 is preferably made of a resin such as ABS, polyethylene, polystyrene, PET, etc., which is resistant to radiation sterilization. If the surface is embossed, it will be non-slip.
[0020]
FIG. 3 is an actual use diagram. When the end of the drill shaft is sandwiched between the index finger and the middle finger and a grip fist is made, the grip 4 fits into the palm without any gaps, and it is easy to insert and remove the drill into and out of the sternum. After penetrating the drill, turn the hook hole 3 in the direction opposite to the sternum incision surface, hook the loop portion of the looped wire 5 in the hook hole 3 and pull it, and simultaneously pull up the drill to quickly and easily pass the wire through the sternum. Becomes possible.
[0021]
FIG. 4 is an enlarged view of the drill bit according to the second, fourth, fifth, seventh and tenth aspects. First, the tip of the columnar material is crushed into a two-plane taper 2 by a first press working to form a shape like the tip of a screwdriver. If a projection at the slit 3 is provided in the press die, the slit 3 is formed in the longitudinal direction from the lower end of the two-plane taper 2 at the time of press working. Although this slit 3 is also used for removing cutting chips, when a hole is made in a bone or the like during a surgical operation, negative pressure is applied to the up and down operation of the drill because blood, body fluid, and the like have infiltrated into the hole. It becomes resistance. This has the effect of reducing this resistance. Next, the ridge line portion of the apex and the vertical groove 4 at the center of the ridge line portion are punched out by the second press working. The tip of the drill has the shape of two blades 1a and 1b divided into two at both ends. Finally, the peripheral edge of the two-plane taper and the ridge of the vertex are sharpened. Since the edge of the two blades 1a and 1b is effective in either direction, the sharpness is twice that of the single blade. When used for a surgical operation, the operation time is reduced. It may be rotated in the same direction by 360 degrees, but by alternately repeating left and right rotations by 180 degrees while pushing, it is possible to penetrate in a shorter time. Since the two peripheral edges of the two-plane taper are sharpened, the side surface of the hole can be cut off, the resistance due to camera shake is minimized, and the drill can be easily pulled out even after the hole is formed.
[0022]
FIGS. 5 and 6 (enlarged end views) illustrate a sternum suture drill according to claims 3, 4, 8 and 11. This is a drill for making a hole for passing a sternum suture wire through a bone at the time of cardiovascular surgery, and the tip blade has a fork-shaped two-blade 10a, 10b. The tips of the two blades 10a and 10b are bladed so as to be inclined from the outside to the inside. Since the tip and the periphery are sharpened, sharpness is remarkably improved as compared with a simple conical shape. The fork-shaped two-blade 10a, 10b has a slope 12 at the center of the slope, with one side facing from the front to the tip. A hook groove 11 for pulling up the suture wire is formed on the side surface from the tip. It is possible to pull up the wire with a ring with one touch, which leads to a reduction in operation time. The material of the drill portion is suitable because SUS304, whose hardness has been increased by press working, does not have to worry about breakage. The grip 13 is a T-shaped flat plate, and is insert-molded and connected to the end of the drill shaft. Familiar with the hand and easy to apply force in the vertical direction. The grip surface has half aligned dimples and half dents to prevent slippage. As the grip material, a resin such as ABS, PP, or PE is suitable. The manufacturing method is as follows. The tip is formed by press working using a round bar material, then the blade is sharpened by a grinder, pressed into a core metal 14 for the purpose of preventing rotation and reinforcing, and the grip 13 is formed by insert molding of resin. This is a manufacturing method for connecting and forming the portion and the core metal 14 portion.
[0023]
【The invention's effect】
As described above, according to the present invention, the sharpness of the tip is remarkably improved as compared with the conventional sternum penetrating instrument, so that the problem of bending is eliminated. By forming the chip groove, the chip shaved from the tip is efficiently discharged, and the load on the entire drill is further reduced. The side of the hole can be cut off, the resistance due to camera shake is minimized, and the drill can be easily pulled out even after drilling.
[0024]
Due to the combination of press working and insert molding, there is no manual operation, resulting in a significant cost reduction. In addition, since the resin part is the majority, the volume and weight of the infectious medical waste are reduced, which contributes to the reduction of disposal costs.
[0025]
The grip fits in the palm of your hand without any gaps, making it easy to apply power. When used in conjunction with a wire with a ring, the wire can be passed through the sternum quickly and easily, reducing the operation time.
[Brief description of the drawings]
FIG. 1 is an external view of a sternum suture drill.
FIG. 2 is an enlarged view of a tip.
FIG. 3 is a view showing the use of a sternum suture drill.
[Fig. 4] Enlarged view of drill tip [Fig. 5] Drill of T-shaped flat grip [Fig. 6] Enlarged view of fork-shaped two-blade [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cutting powder groove 2 Blade 3 Hook hole 4 Grip 5 Wire with a ring 6a, 6b Two blades 7 Two plane taper 8 Slit 9 Groove 10a, 10b Fork-shaped two blades 11 Hook groove 12 Slope 13 Grip 14 Core metal

Claims (11)

It is a hand drill that drills holes manually, the shape of the tip blade is tapered, the width from the center of the tip to one edge, and a diagonal straight chip groove is formed from the tip toward the hand, Both edges of the chip groove are blades, and in order to minimize frictional resistance, the edges of the tapered chip groove are gradually sharpened in the direction of rotation and away from the bone surface. A hand drill characterized by a structure that avoids contact with the bone surface. It is a hand drill that drills holes manually, the cylindrical drill tip is tapered in two planes from the vertex toward the hand, the peripheral edge is sharpened, the ridge line of the vertex is from both edges to the center The shape is inclined toward the edge, is provided with a blade, the center of the ridge is vertically grooved, forms two blades, and has a linear slit in the longitudinal direction from the lower end of the two-plane taper A hand drill, characterized in that: It is a hand drill that drills holes manually, the tip of the blade is a fork-shaped two-blade, and the two-blade tip is sharpened from the outside to the inside, and the fork-shaped two-blade A hand drill characterized in that the center cross section has a slope from one side toward the front end. Of the above hand drills, this is a drill for making a sternum suture wire through bone during cardiovascular surgery, and a hook groove is formed on the side from the tip to pull up the suture wire. The sternum suture drill according to any one of claims 1, 2 and 3, wherein: Of the above hand drills, the rod-shaped grip is connected vertically to the end of the drill shaft, and the end of the drill shaft is sandwiched between the index and middle fingers. 4. The hand drill according to claim 1, wherein the hand drill has a shape having such irregularities, and is easy to apply force when manually drilling a hole. 5. The sternum suture drill according to claim 4, wherein the rod-shaped grip portion is vertically connected to the end of the drill shaft, and the end of the drill shaft is sandwiched between the index finger and the middle finger to form a grip fist. 5. The sternum suture drill according to claim 4, characterized in that it has a shape having irregularities so that it fits in the palm without gaps, and that it is easy to apply force when manually making a hole in the sternum. In the hand drill, a T-shaped flat plate-shaped grip is connected to an end of the drill shaft, and the surface of the T-shaped flat plate is provided with dimples or dents for slip prevention. Item 1. Hand drill according to item 1, 2, or 3. In the sternum suture drill according to claim 4, a T-shaped flat plate-shaped grip is connected to the end of the drill shaft, and the surface of the T-shaped flat plate is provided with dimples or depressions for the purpose of preventing slippage. The sternum suture drill according to claim 4, characterized in that: When manufacturing the above hand drill, the tip is formed by press working using a metal round bar material, then bladed with a grinder, pressed into a core metal for the purpose of preventing rotation and reinforcing, and insert molding of resin The method for manufacturing a hand drill according to claim 5, wherein the grip portion and the core metal portion are connected and formed by processing. When manufacturing the above hand drill, the tip is formed by press working using a metal round bar material, then bladed with a grinder, pressed into a core metal for the purpose of preventing rotation and reinforcing, and insert molding of resin The method for manufacturing a hand drill according to claim 7, wherein the grip portion and the core metal portion are connected and formed by processing. When manufacturing the above-mentioned sternum suture drill, the tip is formed by pressing using a metal round bar material, then bladed with a grinder, pressed into a cored bar for rotation prevention and reinforcement, and made of resin. 9. The method for manufacturing a sternum suture drill according to claim 6, wherein the grip portion and the core metal portion are connected and formed by insert molding.

Images